Mount Iliwerung is part of Mount Ili Adowajo which is a “big volcano” in the area of Lomblen Island on a large catastrophic unknown when it happened. Around the southeast of this mountain has collapsed and there is depression Ili Adowajo, which is still left only in the north and west (Mount Paugora, Mount Kawanora). On the northern edge of his depression lies the points 854, 801, 685 and 689; on the western edge formed by a mountain cavity from the top of Ili Adowajo to the south.
After a large catastroph, the depression was filled by a lava dome that still remained visible in Mt Ili Monkey from 592, 565, and 579. In the next great eruption this lava dome was destroyed, except for Ili Monyet. At that time the crater of Mount Ili Adowajo with a diameter of 1 km. According to the population of this crater in 1870 still has a horizontal base with a height of lk. 300 m asl and active solfatara.In that year also in the crater of Ili Adowajo strong eruption and gradually lava climbed upward forming the dome of Mount Ili Werung now.Constructed on the southern rim of the Lerek caldera, Iliwerung forms a prominent south-facing peninsula on Lembata (formerly Lomblen) Island. Craters and lava domes have formed along the N-S and NW-SE lines on the complex volcano; during historical time vents from the summit to the submarine SE flank have been active. The Iliwerung summit lava dome was formed during an eruption in 1870. In 1948 Iligripe lava dome grew on the eastern flank at 120 m altitude. Beginning in 1973-74, when three ephemeral islands are formed, submarine eruptions began on the lower SE flank at a vent named Hobal; several other eruptions took place from this vent before the end of the century (Smithsonian). The last eruption was in 1999.
In addition, the peak of Mount Ili Penutuh (172 m), Ili Lusitobe (247 m), Ili Waloi, and Ili Grippe (69 m). According to Hartmann (1935, pp. 828), Mount Ili Adowajo is the “great volcano” in this area, in an unknown catastrophe, the sector of the mountain collapsed, and the depression of Ili Adowajo, now only part of the north. west, namely Mount Paugora and its slopes, hell a big eruption until the above peaks occur. Among the tops of the volcano still active are Ili Werung, Ili Grippe, and Ili Woloi…
East Nusa Tenggara
City / Regency
a vulcano / active
History of eruption;
1870; There was an explosive activity in the crater of Ili Adowajo, some residents died, formed domes Ili Werung.
1910; Lamaheku and Lerek residents reported the formation of strong smoke from Mount Ili Werung.
1928; The inhabitants saw huge smoke rising, ash falling and forming a new lava dome on Mount Ili Werung.
1948; There was an eruption and the formation of Ili Gripe and Ili Petrus cones.
1949; Strong solfatara activity
October 2, 1950; At 21:30 there was a roar. Hot clouds slid up the shore. Lapili rain and sand is not so hard, 1 hour long. The ash thickness in my Lamahe 2 mm.
November 16, 1951; Hours 10.00 high smoke 600 m. Hot clouds glide toward Kawanora. Pumice stone up to 8 km. Sand and ash all over the island. 15 burning houses in Lerek, 1 house in Lamanuna; 3 houses collapsed in Lerek; 50 people were injured by lapili; 30 goats and dead chickens; 30 hectares of damaged gardens in Lerek, Lamanuna, Lamaheku, Riang Paugora, Mere Puha.
Elevation (meters above sea level);
1.018 m (3.340 ft)
Type of eruption;
Topology & Geology;
The crater of Mount Ili Werung contains no water, and has a diameter of approximately 250 m and a depth of 50 m.
According to Hartmann (1935, pp. 825) Mount Ili Werung is the youngest peak in the mountains located between the bays of Labala and Waiteba. From Waiteba it is clear that the summit of Paugora is the highest point of a northwestern slope of a major depression called Adowajo depression. This depression in the form of horseshoes that open to the south continues to enter the sea with a slope of about 10 to the south. Mount Ili Werung is in the middle of this depression. To the west of this depression is Mount Kawanora whose bundle is joined to the slopes of Mount Paugora to the sea as if it were the western wall of the depression.
Based on the sublimate example of the November 16, 1951 eruption, the water-soluble sublimate was 24.8%, containing a lot of alum K and Na, chloride (Fa, Ca), and acid reactions. The insoluble in water is 75.2%, containing volcanic ash acid with a bit of gypsum and sulfur.
From the results of solfatara temperature examination during this time, it was noted that the temperature of solfatara in Mount Iliwerung complex ranges from 70-100 ‘C.